# RingCT #### The Basics RingCT, short for Ring Confidential Transactions, is how transaction amounts are hidden in Haven. Ring CT was implemented in block #1220516 in January 2017. After September 2017, this feature became mandatory for all transactions on the network. RingCT introduces an improved version of @ring-signatures called "A Multi-layered Linkable Spontaneous Anonymous Group signature", which allows for hidden amounts, origins and destinations of transactions with reasonable efficiency and verifiable, trustless coin generation. For more information, please read the creator Shen Noether's paper [here](https://eprint.iacr.org/2015/1098). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://wiki.havenprotocol.org/overview/ringct.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.